Present address: Royal Netherlands Meteorological Institute, PO Box 201, 3730 AE De Bilt, The Netherlands
Diurnal and seasonal variation of carbon dioxide exchange from a former true raised bog
Article first published online: 4 JAN 2002
Global Change Biology
Volume 4, Issue 8, pages 823–833, December 1998
How to Cite
NIEVEEN, J. P., JACOBS, COR. M. J. and JACOBS, A. F. G. (1998), Diurnal and seasonal variation of carbon dioxide exchange from a former true raised bog. Global Change Biology, 4: 823–833. doi: 10.1046/j.1365-2486.1998.00189.x
- Issue published online: 4 JAN 2002
- Article first published online: 4 JAN 2002
- Received 20 June 1997;revised versionreceived 17 October andaccepted 28 November 1997
- carbon balance;
- carbon dioxide;
- eddy covariance;
- peat bog
Carbon dioxide exchange was measured, using the eddy covariance technique, during a one and a half year period in 1994 and 1995. The measurements took place over a former true raised bog, characterized by a shallow peat layer and a vegetation dominated by Molinia caerulea. The growing season extended from May until late October, with a maximum LAI in August of 1.7.
The carbon balance shows a net release of 97 g C m–2 y–1 (265 kg C ha–1 y–1) from the peat bog ecosystem to the atmosphere. During June, July and August there is net consumption of CO2, while during the rest of the year there is net production of CO2. The average daytime assimilation rates ranged between – 0.2 and – 0.5 mg CO2 m–2 s–1 (– 45 and –11.3 μmol CO2 m–2 s–1), in a period where the LAI ranged between 1 and 1.7. A high vapour pressure deficit (> 15 hPa) corresponding with high temperatures was found to reduce the assimilation rate by on average 50%. Apart from these factors, LAI and the soil temperature codetermine the net exchange of CO2.
The total nocturnal respiration during the growing season lies within the same order as the average daytime net assimilation rate. Temperature was found to be the main factor controlling soil respiration, with a Q10 of 4.8.